I find Shellback to be servicable.
Sailor Jerry to be undrinkable.
Captain Morgan to be the rum equivalent of Budweiser.
Coruba is ca-rap-a.
Oakheart to be acceptable.
And Cruzan to be a disappointment.
Trader Vics is delightful (unlike every other rum they make).
Blackbeard and Blackheart are two tasty treats.
Seven Tiki is good.
Kraken is good in...something. Never by itself.